An elevation is different. It shows the face of something, or perhaps more correct, the projection of an object/s to a plane. But my testing suggests it produces SECTIONS, not elevations.
Yes, you can use abbreviations in tables and figures. All abbreviations used in tables and figures should be defined in the table note or figure caption, respectively, even though the abbreviations will be also be defined in the text if they are used there.
n, pl -mies. 1. a figure representing the human form, used for displaying clothes, in a ventriloquist's act, as a target, etc. 2. a. a copy or imitation of an object, often lacking some essential feature of the original. b. (as modifier): a dummy drawer. 3. slang a stupid person; fool.